Finally it works. But I don't know why it doesn't work previously. Thank you all

Code:

[OpenBSD]
Apache
It Worked!
If you can see this page, then the people who own this host have just
activated the Apache Web server software included with their OpenBSD
System. They now have to add content to this directory and replace
this placeholder page, or else point the server at their real content.
Documentation
The Apache manual is available with distribution as part of the misc
file set.
Especially read the SSL documentation carefully within the manual, in
addition to the ssl(8) and httpd(8) manual pages.
Graphics
-- press space for next page --
Arrow keys: Up and Down to move. Right to follow a link; Left to go back.
H)elp O)ptions P)rint G)o M)ain screen Q)uit /=search [delete]=history list